CVE-2023-36486 – This vulnerability allows remote authenticated ... (How to Fix)

Q: What is the severity of CVE-2023-36486?

CVE-2023-36486 has a CVSS score of 7.2 (HIGH). This vulnerability allows remote authenticated users to execute arbitrary system commands on the ILIAS application server by uploading a workflow definition file with a malicious filename. The attacker needs valid credentials but can then run commands as the application user, potentially compromising the entire server. This affects ILIAS e-learning platforms running vulnerable versions.

📋 TL;DR

This vulnerability allows remote authenticated users to execute arbitrary system commands on the ILIAS application server by uploading a workflow definition file with a malicious filename. The attacker needs valid credentials but can then run commands as the application user, potentially compromising the entire server. This affects ILIAS e-learning platforms running vulnerable versions.

💻 Affected Systems

Products:

ILIAS Learning Management System

Versions: ILIAS before 7.23 and 8.x before 8.3

Operating Systems: All operating systems running ILIAS

Default Config Vulnerable: ⚠️ Yes

Notes: Requires workflow-engine functionality and authenticated user access.

📦 What is this software?

Ilias by Ilias

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⚠️ Risk & Real-World Impact

🔴

Worst Case

Full server compromise leading to data theft, lateral movement, ransomware deployment, or complete system takeover.

🟠

Likely Case

Unauthorized command execution allowing data exfiltration, backdoor installation, or service disruption.

🟢

If Mitigated

Limited impact if proper file upload validation and user privilege restrictions are in place.

🌐 Internet-Facing: HIGH - Web applications are typically internet-facing, and authenticated users could exploit this remotely.

🏢 Internal Only: MEDIUM - Internal users with credentials could exploit, but requires authentication.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires authenticated access and knowledge of workflow file upload functionality.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: ILIAS 7.23 and 8.3

Vendor Advisory: https://docu.ilias.de/ilias.php?baseClass=ilrepositorygui&cmdNode=xd:kx:54&cmdClass=ilBlogPostingGUI&cmd=previewFullscreen&ref_id=3439&prvm=fsc&bmn=2023-12&blpg=786

Restart Required: Yes

Instructions:

1. Backup your ILIAS installation and database. 2. Download and install ILIAS 7.23 or 8.3 from the official repository. 3. Follow the ILIAS update documentation for your version. 4. Restart the web server and verify functionality.

🔧 Temporary Workarounds

Disable workflow-engine uploads

all

Temporarily disable the workflow definition file upload functionality until patching.

# Modify ILIAS configuration to restrict workflow file uploads
# Check ILIAS documentation for specific configuration options

Restrict user permissions

all

Limit which authenticated users can upload workflow definition files.

# Review and modify user role permissions in ILIAS administration panel
# Remove workflow upload permissions from non-essential users

🧯 If You Can't Patch

Implement strict file upload validation to reject filenames with special characters or command injection patterns.
Deploy web application firewall (WAF) rules to block malicious file upload attempts targeting workflow definitions.

🔍 How to Verify

Check if Vulnerable:

Check your ILIAS version via the administration interface or by examining the installation files. Versions before 7.23 or 8.x before 8.3 are vulnerable.

Check Version:

# Check ILIAS version via web interface: Admin > System Information, or # Check version in ILIAS installation directory files

Verify Fix Applied:

After updating, verify the version shows 7.23 or higher, or 8.3 or higher. Test workflow file upload functionality with safe test files.

📡 Detection & Monitoring

Log Indicators:

Unusual file uploads to workflow-engine endpoints
System command execution patterns in application logs
Failed upload attempts with suspicious filenames

Network Indicators:

HTTP POST requests to workflow file upload endpoints with unusual filenames
Outbound connections from the application server following file uploads

SIEM Query:

source="web_server_logs" AND (uri_path="/workflow-engine/upload" OR uri_path="*workflow*") AND (filename="*;*" OR filename="*|*" OR filename="*`*" OR filename="*$(*")

📊 Metadata

CVE ID: CVE-2023-36486

CVSS v3 Score: 7.2 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Published: December 25, 2023

Last Updated: November 21, 2024

🔗 References

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